Problem with Strict NAT on Two XBOX 360's on same LAN

I recently Upgraded our Internet connection which required a Modem upgrade also. The Modem/ Wireless Router is the Cisco DPC 3825. Both XBOX 360's are wired connections to the DPC 3825, one XBOX 360 is Original/White model and the second XBOX 360 is the New Slim Black Model. When both 360's are turned on, the Original XBOX 360 signs in perfectly and stays connected, while the Slim XBOX 360 signs in ,then shortly after Disconnects from XBOX LIVE, when trying to reconnect, it will not reconnect. I have to reboot the Modem to get the Slim Model to connect to LIVE. Then it disconnects again !!

Can some please help !

Thanks

Aliman1_Sr 

 

Question Info


Last updated July 4, 2018 Views 16 Applies to:

Please see this support link as it contains information regarding having two consoles connected to the same gateway:

forums.xbox.com/.../157383.aspx

It's approximately halfway down the page.

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Hi Knowitall, I read that entire page and have tried all suggestions, have tried setting static IP address on one XBOX and port forwarding to it , but that only causes the second XBOX to disconnect from LIVE. I know Microsoft has a list of approved Routers that are multiple console capable but mine is not listed. The Cisco DPC 3825 Modem / Wireless Router is what my ISP has provided me with. Is there any specific Info on this Modem

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Have you tried port forwarding both Xbox'es and using a static I.P on both?  

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Greetings Aliman!

You can forget about Port Forwarding if you have setup multiple xboxes connecting to the same router.

Make sure UPnP (Universal Plug and Play) is enabled. You may also want to disable Block Anonymous Internet Requests. This feature is known to cause NAT issues. Save settings and reboot your gateway. Both of you console's should be set to obtain IP and DNS Automatic.

Make sure your default gateway is up-to-date with the latest version of firmware.

This specific model from Cisco will probably not work with multiple xboxes, but give it a try.

Keep us posted! 

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Hi Taidara, yes UPnP is enabled, and Block Anonymous Internet Requests is disabled. I'm still having the problem.

As far as Port forwarding goes , you can't open the same Port to Two different IP's.

I'm really running out of Idea's.

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Since UPnP didn't work this may go down the same lonesome road, but you could try it anyway as long as your troubleshooting.

Turn off UPnP and configure Xbox networks ports used by Xbox LIVE with Port range Triggering. 

 

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If you have UPNP on you have to disable ALL Port Forwarding. Also DMZ and so on have to be disabled.

Please Restart  your Router if only UPNP is enabled. UPNP is the only way to go ! No other way will help if you use more than 1 Box.

Do you have the newest Firmware?

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Hi,

Sadly on certain routers are capable of supporting multiple Xboxes properly , if you are using the latest firmware and UPnP does not work on its own its unlikely to work at all really, you may have to put the modem/router into modem only mode (bridged) if it is supported and buy a compatible router:- www.unofficialguidetolive.co.uk/.../60-two-xboxes-using-one-router-internet-connection

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Yes I think your right. I called my ISP and they said they have a different model to upgrade to , Hitron CDE 30364. They just got a shipment in today. Any one ever heard of this Brand ?

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I haven't no, chances are it won't work though (sorry to be so negative) you would be best to find out if you can bridge the  modem (current one) and then buy a router you know works

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